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I think the changeover took effect in 1975. My silver face was a '74 that I bought new in Jan '75. The very next catalogue that I got showed the new graphic style with the black/white/red motif and the colored Sunn((O)))) logo.

Still a few people around.

I don't know the answer to your question, but a quick look at the catalog thread tells me that the Concert Bass was silver and 150 watts in 1975, black and 200 watts in 1979. So, the best I can say is after 1975, but no later than 1979.

Hello friends! I have 2 black face Concert Bass amps and 1 silver face with Concert Slave. Does anyone out there know what year they switched to the black face 200w? It seems that this particular model has very little info on it. This is a great site btw! I hope cats are still posting on here.....

I haven't made any headway yet. Two reasons, first I've been traveling pretty extensively, the second reason is more relevant.
When I spoke with Rogan, they told me that someone else, someone who I would absolutely defer to should he decide to move forward, was inquiring about having a run of the same knobs made. I'm thinking that with their 500 unit minimum, 1000 of them would be a serious glut of them in a somewhat limited market.

I haven't heard back from this other party as of yet, however I will send the "George" knob, sitting in front of me as I type this, to Rogan next week and at least get the firm quote and report back.

Any recent development on the possibility of a knob run?

Actually, "restoring" is not the right word.  A little back story: I've taken a stock 212LH from the late '70's and re-worked the front grill/faceplate to resemble the silver-face era cabinets with no faceplate section.  Fairly straightforward carpentry, with almost no tolex work.  I'll also swap the original Sunn 12's with 2 PMR bass speakers (freq resp 29hz - 4.25khz) This is all to finally achieve a 2 x 12" cab  to pair with a '71 200S.  I had a 2 x 12 cab custom ordered and paid for, but it never materialized. I even supplied the Fender Sunn tolex for it.  After much back and forth w Reverb, I finally got the remaining tolex back, but no cabinet. Needless to say, I have no use for the cabinet maker, regardless of his standing in the business.

So since it's not actually a stock cabinet restoration, the period correctness is not critical, as long as it's a silverface bold font.

From the SUNN FB group

There are several different nameplates in the 68-74 period. Look at this thread:

https://forum.sunnstillshines.online/index.php?topic=4099.msg15153#msg15153

Try to determine exactly which one was original to your cabinet.

I'm looking for a silver-face Sunn nameplate from the '68-'74 period to use on a cabinet I'm restoring. Can offer up to $75 for one in good condition.  What's anybody got ?

I sent him a message, we?ll see!  Thanks for you help.